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Eagle Claw Fishing Reel

Figure 1: Fishing reel direct from packaging

Figure 2: Exploded view of the fishing reel

Questions for Analysis

1. What is the primary function of the device? How does it accomplish it?

The primary function of the devise is to wind fishing line and allow it to spool out. It accomplishes this by using the bail and spool in conjunction. The bail spins around the circumference of the spool there by winding the fishing line around the spool.

1) Smooth action: Comfort
2) Light weight: Heavy is tiring
3) Geared Up: works faster easier to maintain good speed when reeling in.
4) Strong: Reels get mild abuse when taken in and out of boats trucks and cars.
5) Corrosion resistance: water is a pervasive element when fishing.
6) Reliability: It must work when you want it to.
7) Compatibility: A reel is no good if it doesn’t fit on a fishing rod.

Detailed Part Analysis

Spool

The material as well as the surface finish and various dimensions which will be explained later.

2

What are the critical features and dimensions?

One critical dimensions is the spool depth which determines how much line the spool can hold. Another is the surface roughness of the drag setting interface which determines the range or drag settings the reel can have. The line clip is also a key feature since it prevents line from unraveling from the spool after use. Lastly, the rounded leading edge ensures minimal friction with the line as it is being cast.

3

What kind of loading do we expect to be on the component?

Loading will consist of a small tangential force to the spool during line winding and a small axial force on the spool from the oscillation shaft. The main forces on the spool will occur when a fish "runs" and puts high tension on the line. This will cause a torque on the shaft which will be resisted by the friction force between the drag setting interface and the cap.

4

What measures can we use to evaluate performance?

The spool's performance can be measured by its weight as well as its line carrying capacity. Another measure would be the range of torques the drag system can resist.

Crown Gear

Pro/E rendering

Pro/E rendering

Table 3: Crown Gear

1

What Decisions were made in the design of this component?

The material and gear sizes were selected to produce the desired wear resistance and gear ratios. Also, there are teeth located on each end of the shaft so that the handle can lock in from either side to accommodate right and left handed users.

2

What are the critical features and dimensions?

The two gears on this transmission shaft use different numbers of teeth to get different results.

Geared up: The large gear meshes with a smaller helical gear (Table 1, Part 8) in the reel to enable to user to reel in more line with less turns of the handle.

Geared down: The smaller gear shown meshes with a larger gear in the scotch yoke (Table 1, Part 3) to produce a slower oscillation to distribute the line on the spool.

3

What kind of loading do we expect to be on the component?

We expect moderate loading on this part that will be well within the strength limit. Since line tension is orthogonal to the direction that the bail spins to wind it, the stress placed on the large gear by the helical gear is greatly reduced despite being “geared up.”

4

What measures can we use to evaluate performance?

To evaluate the performance of this part, we can measure gear ratios and the friction between the gears. Both are valid numbers that directly affect the input force required to operate the reel.

Helical Gear

Table 3: Helical Gear

1

What Decisions were made in the design of this component?

The material and gear sizes were selected to produce the desired wear resistance and gear ratios. The helical gear is used to change motion in one axis to another axis.

2

What are the critical features and dimensions?

The taper of the helical gear is important so that the gears mesh smoothly.

3

What kind of loading do we expect to be on the component?

We expect moderate loading on this part that will be well within the strength limit. It is a rotational torque that moves the gear assemble around the shaft that passes through it.

4

What measurements can we use to evaluate performance?

To evaluate the performance of this part, the taper of the gear can be measured so that it will match that of the crown gear. Also the fit of the axel that goes thought the center axis of the part.